Well the fact that Jango would be killing someone he felt was his son (and technically is) would cause the same problems for him as the situation with the son-to-father relationship. However, if it came down to a mark situation I feel that Boba would deal with it professionally and with certian regrets, but quickly. Boba Fett is also somewhat around the age of 28 or 30 during the time he comes out of the sarlaac body. So I'm certian that at about that time he is around his prime of physical capability, meanwhile his biological father at prime would be somewhere around the lines of the same age.
However, the level playing field is shattered at that point on. Boba Fett has a clear amount of differnece in understanding of all terms of fighting. Being the successor he has surpassed his father in many ways of combat, knowing nearly 62 unarmed combat styles, aswell as the clear understanding of use with a blaster. We don't know exactly if Jango had an understanding of that many unarmed styles, but he certianly did have the same level of intensitity to expirence as his son.
Though Jango may have fought Dark Jedi, he clearly wasn't able to stand a chance against someone like Mace Windu. From just simple observation Jango is dependent on his technology and blaster skills and that was the fault in his fight with Mace Windu.
The simple jump at the lightsaber in hopes of preventing Mace Windu of further fighting with his prized possession and most powerful weapon was foolish. It was a fault that I'm certian Boba wouldn't make in a fight against his father and in a situation similar would take the chance to blast at the enemy.
Boba is further in expirences and has learned from his fathers faults and become highly looked upon in the guild of Bounty Hunting.
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"Abo are sooo...ugly!"-Dashawn